Create a calculated field using formula -
DATEADD('day', 2-DATEPART('weekday', today()), today())
Haven't tested it but I think this will give you correct values.
I just tested it out and it works, the assumption made in the calc is that the weeks begin on Sunday. So, Sunday 9/21 returns 9/22 in this calc.
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DATETRUNC('week', TODAY()) + 1
DATETRUNC truncates the date to the previous Sunday --- assuming you haven't changed the date properties for the data source. And since Tableau represents dates as integers you can add 1 to get Monday.
Very slick solution. Functions exactly how I want it to!